Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2ab8f60db2db98c…

MALICIOUS

PDF

118.3 KB Created: 2021-04-04 14:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 438d5cac712ed1ce762e10294b2b15ce SHA-1: 6ef7dc96c13288af59b91f9be4d024bf48e284d0 SHA-256: b2ab8f60db2db98c531d1d19e32c61506f9e0363c4a76825efc18e76b505c9fd
272 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to malicious content. Heuristics indicate the presence of malicious redirector links and a general ML classification of maliciousness. The document body, though heavily obfuscated, contains text related to a 'Tennessee sb8005 bill summary', suggesting a lure to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crophysi.ru/strik?utm_term=tennessee+sb8005+bill+summary In PDF document text
    • https://boxesagako.weebly.com/uploads/1/3/4/5/134589877/87b33ff0c8f1.pdfIn PDF document text
    • https://kajizifobizixa.weebly.com/uploads/1/3/3/9/133997117/wubaniji_fevuxez_sokusedub.pdfIn PDF document text
    • http://reduslim-eu.site/dutuwixoduydp6u.pdfIn PDF document text
    • http://okclub.org/grade_4_spelling_words_canadak1uta.pdfIn PDF document text
    • http://thecet.xyz/webapinsmxoe.pdfIn PDF document text
    • http://life-news.tech/omega_vsj843_slow_juicer_reviewfqgpn.pdfIn PDF document text
    • http://cartest.pro/7.3_powerstroke_transmission_dipstick_tube_replacementb3qpk.pdfIn PDF document text
    • http://prequester.online/marriage_counseling_near_me_that_take_insurancezdmk8.pdfIn PDF document text
    • http://shopsupergood.site/wugabotab0svi0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/60594610-3f2c-404e-b8a6-7cc455116e66/bissell_quicksteamer_powerbrush_pet_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1283443b-4436-4c03-b9a7-807992058ae2/86530982424.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17d033ca-4814-41f0-99e1-0d8bd2d4a48d/xolesojemamopite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54d179b6-5462-4b8d-9e67-b1a48d4d3e11/13527374432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2126602e-59bf-4e20-9cef-729c076d830a/good_profit_charles_koch_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49d6648f-92fb-46a9-9876-760b2113a2ce/72370604616.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eee1534f-93fa-484b-b90a-a9035f1d5da3/siriusxm_-_onyx_plus_satellite_radio_receiver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8fbb87c-2cd9-41fe-9527-033accd4eae4/buy_fish_philosophy_video.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E28 5484 bytes
SHA-256: ac27c4a5ffa0b90ae3fe551229f6f79937ad4efcee5d8a22fc7ea8c41d117f74
font_01_sfnt_off0001a0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0B7 12876 bytes
SHA-256: a07c6d774acfe2698adcf315e2883f4ef532f5f81b22e513caeda8297fb7b832

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